Wired.RoboticCar

8/7/2019 Wired.RoboticCar

http://slidepdf.com/reader/full/wiredroboticcar 1/30

WIRED ROBOTIC CAR

Primary Step in the Field of Robotics…



Objective

10/23/20102

To design a manually controlled car capable of crossinga track flooded with various hurdles in minimum

possible time.

This basically requires:• A good design• A good control

• Team co-ordination



Design



Wired Robotic Car

10/23/20104

A simple assembly of various components like

For Bot:

Motors Wheel Set Grip

For Remote: DPDT Switches

Circuit Board

AC to DC Converter



General Constraints

10/23/20106

Every Robotic Hurdle Race involves various constraintslike:

Size Constraint(Generally 30x 30x 30cm or 25x 25x 25cm)

Voltage Constraint(Generally 24 V DC)

Power Constraint



Power Source

(AC to DC Conversion)

10/23/20107

We are already familiar with the concept of AC & DC supply andconversion of AC into DC.Various methods used for this purpose are:

Rectifier Transformer – step down transformer Diode & Capacitor – to convert a.c to d.c

Battery – for onboard operations of car

Adapter – should be minimum of 12v and 500mA

Laptop Charger



Transformer

Transformer

CenterTapping

MultiTapping

AutoTransformer

Advantages:• Easily Available• Cheap

Disadvantages:

• Current Weakens Due to Heating Effect• Bulky



Transformer » Rectifier

T r an s f or m er

Input

Input

Output

Output

12

12

0



Specifications

Transformer » Rectifier

– 12-0-12 (Center Tapping)

– 5 Ampere– Diode: 5608

– Capacitor: 4700 µF, 36 V

Laptop Charger

– 18.5 – 19.5 V– 3.5 Ampere



Remote Design

DPDT Connections(Double Pole Double Throw)

+ - + - + -



PCB Circuits

(Printed Circuit Board)

+ - + -



Motors

Motors

AC Motor DC Motor

Toy Motor Geared Motor

Internal Geared

External Geared

Self Locking, High Torque



Specifications

Voltage Rating

Current RatingRPM

Weight

Shaft Dimension



General Basics

Linear Speed = RPM x Radius

RPM x Torque≡

Power≡

V x I

Control Vs. Speed

Gear Ratio



Wheels

Wheels

Robotic WheelBicycle Supporting

Wheel

Cheap

Easily Available

Robust

Expensive

Weak



Specification

how to select wheel

External Diameter

Internal Diameter– Bush

Thickness

– Doubling

Material & Surface



Wheel Surface

(Track Belts & Grips)

Floor Mat

Cricket Bat Grip

Tyre Tube

Front to Rear Belt

– Tank type track belt



Assembly of Components

Using Internal Geared Motor

Using External Geared Motor



Simplest Car

Material Used:

– 4 x 100 rpm Motors (Robokit, Vega)

– 8 Wheels (Diameter = 6 cm)

– Floor Mat as Track Belt

– Iron Chassis

– DPDT Remote Control– Laptop Charger as Power Source



Chassis

Step 1: Take an iron strip of around 1 mm thickness

14 cm

16 cm



Chassis

Step 3: Bend the strip perpendicularly at a distance of 4cm from left & right edge

Step 4: Screw up motors & other accessories.

Top View Bottom View



Slight Change

Step 1: Take an iron strip of around 1 mm thickness

18cm

4cm

Step 2: Drill the strip as shown 2cm

2cm

13mm



Step 3: Mark lines on the strip as shown. 2cm

2cm

13mm4cm

1.5cm

1.5cm

1cm

Repeat Step 1-3 to make a similar strip.

Step 4: Take two another strips of shown dimensions

4cm

10cm



Step 5: Place the two strips made in Step1-3 in the vertical plane and weld themtogether with the help of strips made in step 4.

4cm

10cm

18cm



Most Successful Design

Material Used:

– 4 x 100 rpm Motors (External geared)

– 4 Wheels (Diameter = 10 cm)

– Floor Mat as Track Belt

– Iron Chassis

– DPDT Remote Control– Transformer as Power Source



Milind Singal: 9873243053Ajay Verma: 9911982505Mohit Gupta: 9466643004

Wired.RoboticCar

Documents

Transcript of Wired.RoboticCar